Selecting Item inside Child Arrays Javascript -

i produce array , want grab first item in each of child arrays:

arrayname = [[item1,item2,item3,item4],[item1,item2,item3,item4],[item1,item2,item3,item4]]; 

i'm trying in loop:

var num = arrayname.length; (i=0; < num; i++) { var title1 = arrayname[i][0]; } 

but on alert:

alert(title1); = [ [ [ 

i need:

alert(title1); = item1 item1 item1 

i've tried using .nodevalue, .firstchild, etc still not finding answer. what's right way?

var num = arrayname.length; var title1 = new array(); (i=0; < num; i++) { title1.push(arrayname[i][0]); } console.log(title1); 

better?